Taxation (Tables)

12 Months Ended

Dec. 31, 2013

IncomeTaxDisclosureTextBlockAbstract

Schedule of Income before Income Tax, Domestic and Foreign

The components of income before taxes for the years ended December 31 are as follows:

Origin of income before taxes	2013		2012			2011
United States	$	6,025	$	5,655		$	8,244
Foreign	1,840		(577		)	1,013
Income before taxes	$	7,865	$	5,078		$	9,257

Schedule of Components of Income Tax Expense (Benefit)

Significant components of income tax expense for the years ended December 31 are as follows:

	2013			2012			2011
Current:
Federal	$	1,114		$	1,529		$	1,456
State	334			425			402
Foreign	836			471			482
Total current	2,284			2,425			2,340
Deferred:
Federal	642			9			674
State	(78		)	1			95
Foreign	(84		)	(133		)	—
Total deferred	480			(123		)	769
Income tax expense	$	2,764		$	2,302		$	3,109

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation between the provision for income taxes calculated at the U.S. federal statutory income tax rate and the consolidated income tax expense in the consolidated statements of operations for the years ended December 31 is as follows:

	2013		2012		2011
Provision at the U.S. federal statutory rate	34.0	%	34.0	%	34.0	%
State taxes, net of federal benefit	1.9	%	4.2	%	3.2	%
Foreign tax rate differential	(2.5	)%	—	%	(1.2	)%
Valuation allowance	2.9	%	10.5	%	2.7	%
Research credits	(4.2	)%	(10.0	)%	(6.5	)%
Stock-based compensation	(0.4	)%	0.3	%	—	%
Other	3.4	%	6.3	%	1.4	%
Income tax expense effective rate	35.1	%	45.3	%	33.6	%

Schedule of Deferred Tax Assets and Liabilities

The deferred tax assets and liabilities at December 31 are as follows:

	2013			2012
Deferred tax assets:
Stock compensation expense	$	4,922		$	7,936
Alternative minimum tax credit	—			71
Warranty reserve	232			291
Bad debts reserve	131			65
Vacation accrual	188			157
Commissions and other accruals	223			205
Deferred rent liability	36			53
Equipment	92			69
Intangible assets	921			778
Net operating loss carryforwards	1,833			1,868
Total deferred tax assets	8,578			11,493
Deferred tax liabilities:
Equipment	(1,610		)	(1,466		)
Prepaid expenses	(285		)	(200		)
Patents	(628		)	(489		)
Goodwill	(3,792		)	(3,193		)
Other	(12		)	(16		)
Total deferred tax liabilities	(6,327		)	(5,364		)
Net deferred tax asset before valuation allowance	2,251			6,129
Valuation allowances for deferred tax assets	(1,833		)	(1,868		)
Net deferred tax asset	$	418		$	4,261

Schedule of Amounts Recognized in Balance Sheet

Net deferred tax assets and liabilities are recorded as follows within the consolidated balance sheets:

Current assets	$	477		$	573
Long-term (liability) assets	(59		)	3,688
Net deferred tax asset	$	418		$	4,261

Summary of Valuation Allowance

The change in the valuation allowance for deferred tax assets for the years ended December 31 is as follows:

Year	Balance at January 1		Charged to costs and expenses	(Deductions)/Other		Balance at December 31
2011	$	1,102	—	225		$	1,327
2012	$	1,327	—	541		$	1,868
2013	$	1,868	—	(35	)	$	1,833

Schedule of Unrecognized Tax Benefits Roll Forward

The following table summarizes our unrecognized tax benefit activity (excluding interest and penalties) during the years ended December 31, 2013, 2012 and 2011:

Description	2013			2012			2011
Balance at beginning of period	$	39		$	505		$	664
Increases in positions taken in a prior period	—			—			—
Decreases in positions taken in a prior period	—			—			—
Increases in positions taken in a current period	65			39			117
Decreases in positions taken in a current period	—			—			—
Decreases due to settlements	(39		)	(202		)	—
Decreases due to lapse of statute of limitations	—			(303		)	(276		)
Balance at end of period	$	65		$	39		$	505